Enable contrast version

Tutor profile: David M.

Inactive
David M.
PhD student(Chemical Engineering) at Monash University
Tutor Satisfaction Guarantee

Questions

Subject: Organic Chemistry

TutorMe
Question:

Why are phenols more acidic than alcohols?

Inactive
David M.
Answer:

When an acid dissociates in water, it releases hydronium (or H+) ions. When a compound is more likely to release H+, the more acidic it is. In the case of phenols and alcohols, phenols are more likely to release H+ because the resulting phenoxide ion (the conjugate base of phenol) is resonance-stabilised. This means that the negative charge is delocalised in the aromatic ring; the conjugate base is more likely to form. On the other hand, alcohols do not give H+ ions easily to form alkoxide ions; they are unstable and readily take H+ ion and form alcohol again.

Subject: Biochemistry

TutorMe
Question:

Why does adenine combine with thymine only and not cytosine?

Inactive
David M.
Answer:

The rules of base pairing (or nucleotide pairing) are: A with T: the purine adenine (A) always pairs with the pyrimidine thymine (T) C with G: the pyrimidine cytosine (C) always pairs with the purine guanine (G) This rule is known as "Chargaff's rule". This complementary pairing is generally based on the formation of hydrogen bonds of the bases with each other to form the DNA double-helix structure. Adenine forms two hydrogen bonds with thymine and cytosine binds with guanine with three hydrogen bonds.

Subject: Basic Chemistry

TutorMe
Question:

Why does water boil at a high temperature (100 C)?

Inactive
David M.
Answer:

Water has a high boiling point because the water molecules are held by significant strong forces called hydrogen bonding. To overcome these forces, a significant amount of heat (or kinetic energy) is required.

Contact tutor

Send a message explaining your
needs and David will reply soon.
Contact David

Request lesson

Ready now? Request a lesson.
Start Lesson

FAQs

What is a lesson?
A lesson is virtual lesson space on our platform where you and a tutor can communicate. You'll have the option to communicate using video/audio as well as text chat. You can also upload documents, edit papers in real time and use our cutting-edge virtual whiteboard.
How do I begin a lesson?
If the tutor is currently online, you can click the "Start Lesson" button above. If they are offline, you can always send them a message to schedule a lesson.
Who are TutorMe tutors?
Many of our tutors are current college students or recent graduates of top-tier universities like MIT, Harvard and USC. TutorMe has thousands of top-quality tutors available to work with you.